Peocess fob embellishing glass



Patented Nov. 28,1922.

rnaoY n'nwennoonnnnn OTSY'DNEY, Nnw'souxrn warns, AUSTRALIA.

PROCESS FOR EMBELLISHING GLASS.

N Drawing.

To all whom it may concern:

Be it known that I, PERCY- EDWARD COR- nnLL, subject of the-King of Great Britain and Ireland, residing at Sydney, in the county of Cumberland and State of New South ales, Australia, have invented certain new and useful Improvements in Proc-- esses for Embellishlng Glass, of which the following is a specification.

The object of the present invention is to procure in the embellishment of sheet or plate glass novel artistic-effects not hitherto obtainable by so called glass embossing, or by surface graining, or by other known methods.

It is already known that by treating one surface of a transparent glass sheet or plate with fluoric acid, or with white acid, or

. by sand-blasting or grinding, pattern effects may be obtained. Patterns in a number of designs for advertising signs and for window decoration are thus made by partitreatment, using sand-blasting or grinding for certain lines and surfaces and another method for other lines and surfaces. But the effects so obtained are flat as they result from differences in surface characteristic only. According to the present invenr tion, strong relief effects are obtained, characterized in that certain desired lines or areas show shadow margins and definite borders, with a pronounced suggestion of depth in a field surfaced to display the relief effect. v

In carrying out the invention, the whole or part of the rear surface of a sheet of transparent glass is frosted by sandblasting or by grinding or otherwise, to

produce a ground. Then upon the frosted ground surface a pattern 1s incised in reverseby deep sand-blasting. to a depth of one fortieth of an inch more or less using a resistant stencil as a guide. It is essential that the incised pattern shall have a frosted finishthis is attainedby producing it by sand blasting. The incised pattern thus produced may consist of letters or figures or of a diaper or other design, andappears to the eye as if it were of very substantially greater depth than it is in fact.

In an alternative method of operation the deeply sand-blasted design may be produced first and'the frosted field surface produced over the whole or a part of the area by subsequent treatment.

AppIication filed May a, 1922. Serial No. 559,428.

The super-posing of the deeply cut sandblasted pattern on the frosted. field surface, results in the production of characteristic light-and-shade effects which when viewed from the front of the glass are highly suggestive of true high relief embossing and are entirely distinct from the effects obtained hitherto, Whether the pattern be observed by transmitted light or by reflected light.

The pattern which is in intaglio on the back ofthe sheet of glass appears from the front of the sheet as if it were standing in high relief, pronounced shadow effects being obtained. I

The best effect is obtained when the lines of the pattern engraving are concave in cross-section, that is to say when the engraved depth below the field surface is greater midway of the width of the pattern line than at and near its edges. This concavity in section is obtained readily by engraving the pattern lines by sand blasting through a stencil.

For the display of names, trade marks, or the like on vehicular or other lamp fronts, or on light-diffusing screens the method is particularly advantageous. The clarity and definition of the deeply blasted lines and their accentuation and display in contrast with the frosted field surface in apparent relief enables the display'of small sized letters and figures and their linework patterns in a prominent and striking style. The artistic branding of articles of the kind indicated may be effected according to this invention rapidly and at low cost. For the embellishment of decorative panel-plates for translucent advertising and other signs, and for many other purposes the process is equally well'adapted.

Vhat I claim as my invention and desire to secure by Letters Patent is 1. The herein described process of emr bellishing sheets or plates of transparent glass, which consists in treating the rear sides thereof by engraving a pattern thereinto and frosting the entire surface of the field and the pattern thereon.

2. A process for embellishing transparent sheet or plate glass which consists, in deeply engraving on the rear surface of the glass a reversed pattern design in frosted lines and surfaces and treating the rear surface of the. glass by forming a frosted field'surface on it and onthepattern design thereby procuring a display of the normal pattern design in apparent highrelief on the front face of the glass. y

3. The herein described process of embellishing sheets or plates of transparent side including such patterning. glass, which consists in procuring the ap- In testimony whereof I affix my si nature. pearance of an embossed relief patterning on PERCY EDWARD CORRELL.

the obverse face of the glass by producing reverse intaglio of said patterning in concave section lines on the reverse side of the 10 glass and frosting portions of said reverse 

